How to individually scale more than one face?
Activate the Pivot Point > Individual Origins option on the horizontal menu bar of your 3D view.

On your screenshot, the Median Point was the Pivot Point option selected, which means that the scale will take the median point between all your selected faces into account. Individual Origins will only take into account the center of each face or group of adjacent faces. And so on, if you select 3D Cursor, it will be the pivot point of your operation...